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Marked clinical difference between two sibs affected with juvenile metachromatic leukodystrophy.
J T Clarke1, M A Skomorowski, P L Chang
1Department of Pediatrics, Hospital for Sick Children, Toronto, Ontario, Canada.
American Journal of Medical Genetics
|May 1, 1989
Summary
A rare form of metachromatic leukodystrophy (MLD) presented with a milder clinical course in one sibling despite biochemical similarities to severe MLD. This suggests potential factors influencing MLD
Area of Science:
- Biochemistry
- Genetics
- Neurology
Background:
- Metachromatic leukodystrophy (MLD) is a rare genetic disorder.
- It is characterized by the accumulation of sulfatides in the body.
- Deficiency in arylsulfatase A enzyme activity is a hallmark of MLD.
Observation:
- A patient with juvenile MLD experienced typical neurological degeneration.
- A sibling with similar biochemical MLD markers showed a significantly milder clinical course.
- The sibling developed acute cholecystitis at age 16 due to sulfatide accumulation.
Findings:
- The sibling exhibited profound arylsulfatase A deficiency and increased urinary sulfatides.
- Fibroblast studies confirmed defects in arylsulfatase A activity and sulfatide turnover.
- Electrophoresis indicated no detectable arylsulfatase A isozyme, distinguishing it from pseudo-deficiency.
Implications:
- The findings suggest that factors beyond arylsulfatase A deficiency influence MLD's clinical presentation.
- This case highlights the potential for milder MLD phenotypes.
- Further research into genetic or environmental modifiers of MLD is warranted.